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Educational Codeforces Round 165 (Rated for Div. 2)
29:54:20
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Difficulty:
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data structures
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x540
316E3
Summer Homework
data structures
,
math
2300
x504
873E
Awards For Contestants
brute force
,
data structures
,
dp
2300
x488
316E2
Summer Homework
data structures
,
math
2300
x380
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x167
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7598
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6176
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x4720
1083E
The Fair Nut and Rectangles
data structures
,
dp
,
geometry
2400
x3776
1000F
One Occurrence
data structures
,
divide and conquer
2400
x3503
311B
Cats Transport
data structures
,
dp
2400
x3182
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3171
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x2947
145E
Lucky Queries
data structures
2400
x2894
444C
DZY Loves Colors
data structures
2400
x2773
786C
Till I Collapse
data structures
,
divide and conquer
2400
x2509
1187D
Subarray Sorting
data structures
,
sortings
2400
x2448
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2427
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2411
1251E2
Voting (Hard Version)
binary search
,
data structures
,
greedy
2400
x2352
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2302
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2160
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2154
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2111
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2108
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2077
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2057
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2013
5E
Bindian Signalizing
data structures
2400
x2004
12D
Ball
data structures
,
sortings
2400
x1979
1326E
Bombs
data structures
,
two pointers
2400
x1953
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x1940
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1874
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x1862
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1835
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1809
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1787
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1756
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1726
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1667
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1652
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1649
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1632
1373F
Network Coverage
binary search
,
constructive algorithms
,
data structures
,
greedy
2400
x1618
121E
Lucky Array
data structures
2400
x1605
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1596
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1595
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1563
916E
Jamie and Tree
data structures
,
trees
2400
x1551
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1513
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1512
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1510
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1502
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1493
1093E
Intersection of Permutations
data structures
2400
x1482
869E
The Untended Antiquity
data structures
,
hashing
2400
x1466
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1455
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1445
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1440
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1394
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1376
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1360
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1357
115E
Linear Kingdom Races
data structures
,
dp
2400
x1357
1059E
Split the Tree
binary search
,
data structures
,
dp
,
greedy
,
trees
2400
x1351
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1327
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1322
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1297
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1294
1304F2
Animal Observation (hard version)
data structures
,
dp
,
greedy
2400
x1275
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1237
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1231
1343F
Restore the Permutation by Sorted Segments
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1230
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1178
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1151
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1147
1264C
Beautiful Mirrors with queries
data structures
,
probabilities
2400
x1120
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1108
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1088
377D
Developing Game
data structures
2400
x1079
1089K
King Kog's Reception
data structures
2400
x1078
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1065
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1061
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1058
749E
Inversions After Shuffle
data structures
,
probabilities
2400
x1026
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1026
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1025
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1021
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1018
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1011
1004E
Sonya and Ice Cream
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
trees
2400
x1008
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
707E
Garlands
data structures
2400
x1000
1282E
The Cake Is a Lie
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
2400
x992
1107G
Vasya and Maximum Profit
binary search
,
constructive algorithms
,
data structures
,
dp
,
dsu
2400
x987
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x974
1221F
Choose a Square
binary search
,
data structures
,
sortings
2400
x973
1044D
Deduction Queries
data structures
,
dsu
2400
x968
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x952
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